<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

    <style>
        .div1 {
            height: 600px;
            background-color: aqua;

            padding: 20px;
        }

        .div2 {
            height: 300px;
            background-color: blue;

            padding: 20px;
        }

        .div3 {
            height: 100px;
            background-color: red;

            font-size: 20px;
            color: blueviolet;
            font-style:oblique;
            font-family: "宋体";
        }
    </style>
</head>
<body>
    <div class="div1">
        <div class="div2">
            <div class="div3">
                这里是第三个显示的文字！
            </div>
        </div>
    </div>
</body>
</html>